High-fidelity entangling gates and nonlocal circuits with neutral atoms.

Neutral-atom quantum processor achieved entangling controlled-Z gates with a fidelity of 99.854(4)%, improved to 99.941(3)% with postselection, stable for 10 hours.

• Why it matters: High-fidelity entangling gates are crucial for reducing errors in quantum information systems, enabling deeper circuits and fault-tolerant quantum computation.
• What they did: The researchers used a neutral-atom platform with a high-Rabi-frequency smooth-amplitude pulse, state-selective readout, and qubit reuse to realize and benchmark low-error entangling gates and nonlocal circuits.
• The result: This work demonstrates a pathway toward deep, efficient fault-tolerant quantum computing by integrating high-fidelity gates into complex quantum circuits and studying nonlocal entangled states.